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Which two characteristics of DTLS are true?

Which two characteristics of DTLS are true?(Choose two)
A. It is used mostly by applications that use application layer object-protocols
B. It includes a congestion control mechanism
C. It completes key negotiation and bulk data transfer over a single channel.
D. It supports long data transfers and connectionless data transfers.
E. It cannot be used if NAT exists along the path.
F. It concludes a retransmission method because it uses an unreliable datagram transport
Correct Answer: BF